397 lines
10 KiB
ArmAsm
397 lines
10 KiB
ArmAsm
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|MOTOROLA MICROPROCESSOR & MEMORY TECHNOLOGY GROUP
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|M68000 Hi-Performance Microprocessor Division
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|M68060 Software Package
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|Production Release P1.00 -- October 10, 1994
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|M68060 Software Package Copyright © 1993, 1994 Motorola Inc. All rights reserved.
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|THE SOFTWARE is provided on an "AS IS" basis and without warranty.
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|To the maximum extent permitted by applicable law,
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|MOTOROLA DISCLAIMS ALL WARRANTIES WHETHER EXPRESS OR IMPLIED,
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|INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
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|and any warranty against infringement with regard to the SOFTWARE
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|(INCLUDING ANY MODIFIED VERSIONS THEREOF) and any accompanying written materials.
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|To the maximum extent permitted by applicable law,
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|IN NO EVENT SHALL MOTOROLA BE LIABLE FOR ANY DAMAGES WHATSOEVER
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|(INCLUDING WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS PROFITS,
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|BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, OR OTHER PECUNIARY LOSS)
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|ARISING OF THE USE OR INABILITY TO USE THE SOFTWARE.
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|Motorola assumes no responsibility for the maintenance and support of the SOFTWARE.
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|You are hereby granted a copyright license to use, modify, and distribute the SOFTWARE
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|so long as this entire notice is retained without alteration in any modified and/or
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|redistributed versions, and that such modified versions are clearly identified as such.
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|No licenses are granted by implication, estoppel or otherwise under any patents
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|or trademarks of Motorola, Inc.
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|~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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| os.s
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| This file contains:
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| - example "Call-Out"s required by both the ISP and FPSP.
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#include <linux/linkage.h>
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|################################
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| EXAMPLE CALL-OUTS #
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| #
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| _060_dmem_write() #
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| _060_dmem_read() #
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| _060_imem_read() #
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| _060_dmem_read_byte() #
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| _060_dmem_read_word() #
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| _060_dmem_read_long() #
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| _060_imem_read_word() #
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| _060_imem_read_long() #
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| _060_dmem_write_byte() #
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| _060_dmem_write_word() #
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| _060_dmem_write_long() #
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| #
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| _060_real_trace() #
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| _060_real_access() #
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|################################
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| Each IO routine checks to see if the memory write/read is to/from user
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| or supervisor application space. The examples below use simple "move"
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| instructions for supervisor mode applications and call _copyin()/_copyout()
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| for user mode applications.
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| When installing the 060SP, the _copyin()/_copyout() equivalents for a
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| given operating system should be substituted.
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| The addresses within the 060SP are guaranteed to be on the stack.
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| The result is that Unix processes are allowed to sleep as a consequence
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| of a page fault during a _copyout.
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| Linux/68k: The _060_[id]mem_{read,write}_{byte,word,long} functions
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| (i.e. all the known length <= 4) are implemented by single moves
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| statements instead of (more expensive) copy{in,out} calls, if
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| working in user space
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| _060_dmem_write():
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| Writes to data memory while in supervisor mode.
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| INPUTS:
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| a0 - supervisor source address
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| a1 - user destination address
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| d0 - number of bytes to write
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| 0x4(%a6),bit5 - 1 = supervisor mode, 0 = user mode
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| OUTPUTS:
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| d1 - 0 = success, !0 = failure
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.global _060_dmem_write
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_060_dmem_write:
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subq.l #1,%d0
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btst #0x5,0x4(%a6) | check for supervisor state
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beqs user_write
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super_write:
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move.b (%a0)+,(%a1)+ | copy 1 byte
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dbra %d0,super_write | quit if --ctr < 0
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clr.l %d1 | return success
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rts
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user_write:
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move.b (%a0)+,%d1 | copy 1 byte
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copyoutae:
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movs.b %d1,(%a1)+
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dbra %d0,user_write | quit if --ctr < 0
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clr.l %d1 | return success
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rts
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| _060_imem_read(), _060_dmem_read():
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| Reads from data/instruction memory while in supervisor mode.
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| INPUTS:
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| a0 - user source address
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| a1 - supervisor destination address
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| d0 - number of bytes to read
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| 0x4(%a6),bit5 - 1 = supervisor mode, 0 = user mode
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| OUTPUTS:
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| d1 - 0 = success, !0 = failure
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.global _060_imem_read
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.global _060_dmem_read
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_060_imem_read:
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_060_dmem_read:
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subq.l #1,%d0
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btst #0x5,0x4(%a6) | check for supervisor state
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beqs user_read
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super_read:
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move.b (%a0)+,(%a1)+ | copy 1 byte
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dbra %d0,super_read | quit if --ctr < 0
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clr.l %d1 | return success
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rts
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user_read:
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copyinae:
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movs.b (%a0)+,%d1
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move.b %d1,(%a1)+ | copy 1 byte
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dbra %d0,user_read | quit if --ctr < 0
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clr.l %d1 | return success
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rts
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| _060_dmem_read_byte():
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| Read a data byte from user memory.
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| INPUTS:
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| a0 - user source address
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| 0x4(%a6),bit5 - 1 = supervisor mode, 0 = user mode
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| OUTPUTS:
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| d0 - data byte in d0
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| d1 - 0 = success, !0 = failure
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.global _060_dmem_read_byte
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_060_dmem_read_byte:
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clr.l %d0 | clear whole longword
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clr.l %d1 | assume success
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btst #0x5,0x4(%a6) | check for supervisor state
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bnes dmrbs | supervisor
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dmrbuae:movs.b (%a0),%d0 | fetch user byte
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rts
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dmrbs: move.b (%a0),%d0 | fetch super byte
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rts
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| _060_dmem_read_word():
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| Read a data word from user memory.
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| INPUTS:
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| a0 - user source address
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| 0x4(%a6),bit5 - 1 = supervisor mode, 0 = user mode
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| OUTPUTS:
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| d0 - data word in d0
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| d1 - 0 = success, !0 = failure
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| _060_imem_read_word():
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| Read an instruction word from user memory.
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| INPUTS:
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| a0 - user source address
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| 0x4(%a6),bit5 - 1 = supervisor mode, 0 = user mode
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| OUTPUTS:
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| d0 - instruction word in d0
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| d1 - 0 = success, !0 = failure
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.global _060_dmem_read_word
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.global _060_imem_read_word
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_060_dmem_read_word:
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_060_imem_read_word:
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clr.l %d1 | assume success
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clr.l %d0 | clear whole longword
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btst #0x5,0x4(%a6) | check for supervisor state
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bnes dmrws | supervisor
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dmrwuae:movs.w (%a0), %d0 | fetch user word
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rts
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dmrws: move.w (%a0), %d0 | fetch super word
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rts
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| _060_dmem_read_long():
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| INPUTS:
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| a0 - user source address
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| 0x4(%a6),bit5 - 1 = supervisor mode, 0 = user mode
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| OUTPUTS:
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| d0 - data longword in d0
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| d1 - 0 = success, !0 = failure
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| _060_imem_read_long():
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| Read an instruction longword from user memory.
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| INPUTS:
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| a0 - user source address
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| 0x4(%a6),bit5 - 1 = supervisor mode, 0 = user mode
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| OUTPUTS:
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| d0 - instruction longword in d0
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| d1 - 0 = success, !0 = failure
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.global _060_dmem_read_long
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.global _060_imem_read_long
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_060_dmem_read_long:
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_060_imem_read_long:
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clr.l %d1 | assume success
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btst #0x5,0x4(%a6) | check for supervisor state
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bnes dmrls | supervisor
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dmrluae:movs.l (%a0),%d0 | fetch user longword
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rts
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dmrls: move.l (%a0),%d0 | fetch super longword
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rts
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| _060_dmem_write_byte():
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| Write a data byte to user memory.
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| INPUTS:
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| a0 - user destination address
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| d0 - data byte in d0
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| 0x4(%a6),bit5 - 1 = supervisor mode, 0 = user mode
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| OUTPUTS:
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| d1 - 0 = success, !0 = failure
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.global _060_dmem_write_byte
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_060_dmem_write_byte:
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clr.l %d1 | assume success
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btst #0x5,0x4(%a6) | check for supervisor state
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bnes dmwbs | supervisor
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dmwbuae:movs.b %d0,(%a0) | store user byte
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rts
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dmwbs: move.b %d0,(%a0) | store super byte
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rts
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| _060_dmem_write_word():
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| Write a data word to user memory.
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| INPUTS:
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| a0 - user destination address
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| d0 - data word in d0
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| 0x4(%a6),bit5 - 1 = supervisor mode, 0 = user mode
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| OUTPUTS:
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| d1 - 0 = success, !0 = failure
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.global _060_dmem_write_word
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_060_dmem_write_word:
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clr.l %d1 | assume success
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btst #0x5,0x4(%a6) | check for supervisor state
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bnes dmwws | supervisor
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dmwwu:
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dmwwuae:movs.w %d0,(%a0) | store user word
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bras dmwwr
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dmwws: move.w %d0,(%a0) | store super word
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dmwwr: clr.l %d1 | return success
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rts
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| _060_dmem_write_long():
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| Write a data longword to user memory.
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| INPUTS:
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| a0 - user destination address
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| d0 - data longword in d0
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| 0x4(%a6),bit5 - 1 = supervisor mode, 0 = user mode
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| OUTPUTS:
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| d1 - 0 = success, !0 = failure
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.global _060_dmem_write_long
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_060_dmem_write_long:
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clr.l %d1 | assume success
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btst #0x5,0x4(%a6) | check for supervisor state
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bnes dmwls | supervisor
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dmwluae:movs.l %d0,(%a0) | store user longword
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rts
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dmwls: move.l %d0,(%a0) | store super longword
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rts
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#if 0
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|###############################################
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| Use these routines if your kernel doesn't have _copyout/_copyin equivalents.
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| Assumes that D0/D1/A0/A1 are scratch registers. The _copyin/_copyout
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| below assume that the SFC/DFC have been set previously.
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| Linux/68k: These are basically non-inlined versions of
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| memcpy_{to,from}fs, but without long-transfer optimization
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| Note: Assumed that SFC/DFC are pointing correctly to user data
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| space... Should be right, or are there any exceptions?
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| int _copyout(supervisor_addr, user_addr, nbytes)
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.global _copyout
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_copyout:
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move.l 4(%sp),%a0 | source
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move.l 8(%sp),%a1 | destination
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move.l 12(%sp),%d0 | count
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subq.l #1,%d0
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moreout:
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move.b (%a0)+,%d1 | fetch supervisor byte
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copyoutae:
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movs.b %d1,(%a1)+ | store user byte
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dbra %d0,moreout | are we through yet?
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moveq #0,%d0 | return success
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rts
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| int _copyin(user_addr, supervisor_addr, nbytes)
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.global _copyin
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_copyin:
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move.l 4(%sp),%a0 | source
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move.l 8(%sp),%a1 | destination
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move.l 12(%sp),%d0 | count
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subq.l #1,%d0
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morein:
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copyinae:
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movs.b (%a0)+,%d1 | fetch user byte
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move.b %d1,(%a1)+ | write supervisor byte
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dbra %d0,morein | are we through yet?
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moveq #0,%d0 | return success
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rts
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#endif
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|###########################################################################
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| _060_real_trace():
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| This is the exit point for the 060FPSP when an instruction is being traced
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| and there are no other higher priority exceptions pending for this instruction
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| or they have already been processed.
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| The sample code below simply executes an "rte".
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.global _060_real_trace
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_060_real_trace:
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bral trap
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| _060_real_access():
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| This is the exit point for the 060FPSP when an access error exception
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| is encountered. The routine below should point to the operating system
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| handler for access error exceptions. The exception stack frame is an
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| 8-word access error frame.
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| The sample routine below simply executes an "rte" instruction which
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| is most likely the incorrect thing to do and could put the system
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| into an infinite loop.
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.global _060_real_access
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_060_real_access:
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bral buserr
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| Execption handling for movs access to illegal memory
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.section .fixup,#alloc,#execinstr
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.even
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1: moveq #-1,%d1
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rts
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.section __ex_table,#alloc
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.align 4
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.long dmrbuae,1b
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.long dmrwuae,1b
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.long dmrluae,1b
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.long dmwbuae,1b
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.long dmwwuae,1b
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.long dmwluae,1b
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.long copyoutae,1b
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.long copyinae,1b
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.text
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